The weather instrument is Davis VantagePro2 Plus Fan Aspirated Wireless Weather Station with USB data logger module, rain collector heater, and weather envoy.
Best places to buy it are http://www.provantage.com or http://www.ambientweather.com . You have to email them both for best prices, but they are pretty close to each other and far cheeper than the competition.
Data collection is done by my trusty FreeBSD server which also hosts this website and all the data.